Geological Chronicle
Rima Wan-Yu is a lunar graben structure spanning 13.72 kilometers in length across the lunar basalt crust. Formed by structural faulting and crustal extension, the trench cuts through terrain within the Aristarchus quadrangle (LAC-39).
Officially cataloged by the International Astronomical Union at selenographic coordinates 19.9817° latitude and -31.4332° longitude, the rille designation notes: Chinese female name.